Dreyer Reservoir Report
Last Updated: December 5, 2025
Dreyer is a private irrigation dam located in McCone County, Montana, along McGuire Creek.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1944 by the USDA NRCS, this earth dam stands at a height of 25 feet and has a storage capacity of 428 acre-feet. The primary purpose of Dreyer is for irrigation, serving a drainage area of 4.59 square miles with a maximum discharge of 3000 cubic feet per second.
With a low hazard potential and a condition assessment of "Not Rated," Dreyer is regulated by the Montana Department of Natural Resources Conservation (DNRC) and undergoes regular state inspections and enforcement. The dam is not federally owned or funded, but is designed and constructed by the Natural Resources Conservation Service. It is situated in a remote area without a designated town nearby, making it essential for water resource management in the region.
Overall, Dreyer plays a crucial role in maintaining water resources for agricultural purposes in the area, highlighting the importance of proper dam management and regulation. As a key irrigation structure in Montana, its presence contributes to the sustainable use of water for farming activities along McGuire Creek. It serves as a testament to the collaborative efforts between private owners, state agencies, and federal designers in ensuring the effective utilization of water resources in the region.
Year Completed |
1944 |
Dam Length |
1350 |
Dam Height |
25 |
River Or Stream |
MCGUIRE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Drainage Area |
4.59 |
Nid Storage |
428 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nelson Creek Near Van Norman Mt
|
33cfs |
Redwater River At Circle Mt
|
4cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
Milk River At Nashua Mt
|
233cfs |
Poplar River Near Poplar Mt
|
28cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Dreyer